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9.1 Alarm Displays
9-11
A.410:
Undervoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
• For 100-VAC SERVOPACKs:
The AC power supply voltage
is 49
V or less.
• For 200-VAC SERVOPACKs:
The AC power supply voltage
is 120
V or less.
• For 400-VAC SERVOPACKs:
The AC power supply voltage
is 240
V or less.
Measure the power supply voltage.
Set the power supply voltage within
t
he specified range.
The power supply voltage
dropped du
ring operation.
Measure the power supply voltage. Increase the power supply capacity
.
Occurrence of instantaneous
power int
erruption.
Measure the power supply voltage.
When the instantaneous power cut
hold
time (Pn509) is set, decrease
the setting.
The SERVOPACK fuse is blown
out.
Replace the SERVOPACK, con-
nect a reactor, and run the SERVO-
PACK.
A SERVOPACK fault occurred.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
A.450:
Main-Circuit
Capacitor Overvoltage
A SERVOPACK fault occurred. Replace the SERVOPACK.
A.510:
Overspeed
(The servomotor speed
exceeds the maximum.)
The order of phases U, V, and W
in the
servomotor wiring is incor-
rect.
Check the motor wiring.
Confirm that the servomotor is cor-
rectly wired.
A reference value exceeding the
overspeed detection level was
input.
Check the input value.
Reduce the reference value or adjust
the gain.
The motor speed exceeded the
maximum.
Check the motor speed waveform.
Reduce the speed reference input
gain, adjust
the servo gain, or recon-
sider the operating conditions.
A SERVOPACK fault occurred.
The SERVOPACK may be faulty.
Replace the
SERVOPACK.
A.511:
Overspeed of Encoder
Output Pulse Rate
The encoder output pulse fre-
quency exceeded the limit.
Check the encoder o
utput pulse set-
ting.
Decrease the setting of the encoder
output resolution (Pn281).
The encoder output pulse output
freq
uency exceeded the limit
because the motor speed was too
high.
Check the encoder o
utput pulse out-
put setting and motor speed.
Decrease the motor speed.
A.520:
Vibration Alarm
Abnormal vibration was detected
at the motor speed.
Check for abnormal noise from the
servomotor
, and check the speed
and force waveforms during opera-
tion.
Reduce the motor speed or reduce
the
speed loop gain (Pn100).
The mass ratio (Pn103) value is
grea
ter than the actual value or is
greatly changed.
Check the mass ratio.
Set the mass ratio (Pn103) to an
appropriate value.
A.521:
Autotuning Alarm
(Vibration was detected
whil
e executing the one-
parameter tuning,
EasyFFT, or tuning-less
function.)
The servomotor vibrated consid-
erably while performing tuning-
less function.
Check the motor speed waveform.
Reduce the load so that the mass
rat
io falls within the allowable
value, or raise the load level using
the tuning-less levels setting
(Fn200) or reduce the rigidity level.
The servomotor vibrated consid-
erably during one-parameter tun-
ing or EasyFFT.
Check the motor speed waveform.
Check the operation procedure of
cor
responding function and take a
corrective action.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions
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